Methylhydrazine → ethyl 1-methyl-7-oxo-4,5,6,7-tetrahydro-1H-indazole-3-carboxylate
Reaction equation
C([O:3][C:4]1[C:5](=O)[CH:6]([C:10](=O)[C:11]([O:13][CH2:14][CH3:15])=[O:12])[CH2:7][CH2:8][CH:9]=1)C.[CH3:18][NH:19][NH2:20]>C(O)(=O)C>[CH3:18][N:19]1[C:5]2[C:4](=[O:3])[CH2:9][CH2:8][CH2:7][C:6]=2[C:10]([C:11]([O:13][CH2:14][CH3:15])=[O:12])=[N:20]1Participants
4
Reactant 2
Product 1
Reagents, catalysts & solvents 1
Procedure
30 g (0.125 mol) of ethyl (3-ethoxy-2-oxocyclohex-3-en-1-yl)(oxo)acetate were dissolved in 150 mL of glacial acetic acid and 6.5 mL of methylhydrazine were added. The mixture was stirred at room temperature for 6 hours. The solvent was then evaporated and the crude redissolved with water, the solution made basic with 30% NH4OH and extracted with chloroform. The organic layer was then dried over Na2SO4 and concentrated. The residue was chromatographed on a silica gel column (eluant: chloroform) and crystallized from a mixture n-hexane/diethyl ether (TLC chloroform; 63% yield as a white solid).